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Filename : rc
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#! /bin/sh
#
# rc
#
# Starts/stops services on runlevel changes.
#
# Optimization: A start script is not run when the service was already
# configured to run in the previous runlevel.  A stop script is not run
# when the the service was already configured not to run in the previous
# runlevel.
#
# Authors:
# 	Miquel van Smoorenburg <miquels@cistron.nl>
# 	Bruce Perens <Bruce@Pixar.com>

PATH=/sbin:/usr/sbin:/bin:/usr/bin
export PATH

# Un-comment the following for interactive debugging. Do not un-comment
# this for debugging a real boot process as no scripts will be executed.
# debug=echo

# Make sure the name survive changing the argument list
scriptname="$0"

umask 022

on_exit() {
	echo "error: '$scriptname' exited outside the expected code flow."
}
trap on_exit EXIT # Enable emergency handler

# Ignore CTRL-C only in this shell, so we can interrupt subprocesses.
trap ":" INT QUIT TSTP

# Set onlcr to avoid staircase effect.
stty onlcr 0>&1

# Now find out what the current and what the previous runlevel are.

runlevel=$RUNLEVEL
# Get first argument. Set new runlevel to this argument.
[ "$1" != "" ] && runlevel=$1
if [ "$runlevel" = "" ]
then
	echo "Usage: $scriptname <runlevel>" >&2
	exit 1
fi
previous=$PREVLEVEL
[ "$previous" = "" ] && previous=N

export runlevel previous

if [ -f /etc/default/rcS ] ; then
	. /etc/default/rcS
fi
export VERBOSE

if [ -f /lib/lsb/init-functions ] ; then
	. /lib/lsb/init-functions
else
	log_action_msg() { echo $@; }
	log_failure_msg() { echo $@; }
	log_warning_msg() { echo $@; }
fi

#
# Check if we are able to use make like booting.  It require the
# insserv package to be enabled. Boot concurrency also requires
# startpar to be installed.
#
#CONCURRENCY=makefile
# disable startpar, incompatible with "task" upstart jobs
CONCURRENCY=none
test -s /etc/init.d/.depend.boot  || CONCURRENCY="none"
test -s /etc/init.d/.depend.start || CONCURRENCY="none"
test -s /etc/init.d/.depend.stop  || CONCURRENCY="none"
if test -e /etc/init.d/.legacy-bootordering ; then
	CONCURRENCY="none"
fi
if ! test -e /proc/stat; then
	# startpar requires /proc/stat
	if [ "$(uname)" = "GNU/kFreeBSD" ] ; then
		mount -t linprocfs linprocfs /proc
	elif [ "$(uname)" = "GNU" ] ; then
		mount -t proc none /proc
	fi
fi
if [ -x /lib/startpar/startpar ] ; then
    STARTPAR=/lib/startpar/startpar
else
    STARTPAR=startpar
fi
$STARTPAR -v > /dev/null 2>&1 || CONCURRENCY="none"

#
# Start script or program.
#
case "$CONCURRENCY" in
	makefile|startpar|shell) # startpar and shell are obsolete
		CONCURRENCY=makefile
		log_action_msg "Using makefile-style concurrent boot in runlevel $runlevel"
		startup() {
			eval "$($STARTPAR -p 4 -t 20 -T 3 -M $1 -P $previous -R $runlevel)"

			if [ -n "$failed_service" ]
			then
				log_failure_msg "startpar: service(s) returned failure: $failed_service"
			fi

			if [ -n "$skipped_service_not_installed" ]
			then
				log_warning_msg "startpar: service(s) skipped, program is not installed: $skipped_service_not_installed"
			fi

			if [ -n "$skipped_service_not_configured" ]
			then
				log_warning_msg "startpar: service(s) skipped, program is not configured: $skipped_service_not_configured"
			fi

			unset failed_service skipped_service_not_installed skipped_service_not_configured
		}
		;;
	none|*)
		startup() {
			action=$1
			shift
			scripts="$@"
			for script in $scripts ; do
				$debug "$script" $action
			done
		}
		;;
esac

# Is there an rc directory for this new runlevel?
if [ -d /etc/rc$runlevel.d ]
then
	case "$runlevel" in
		0|6)
			ACTION=stop
			;;
		S)
			ACTION=start
			;;
		*)
			ACTION=start
			;;
	esac

	# First, run the KILL scripts.
	if [ makefile = "$CONCURRENCY" ]
	then
		if [ "$ACTION" = "start" ] && [ "$previous" != N ]
		then
			startup stop
		fi
	elif [ "$previous" != N ]
	then
		# Run all scripts with the same level in parallel
		CURLEVEL=""
		for s in /etc/rc$runlevel.d/K*
		do
			# Extract order value from symlink
			level=${s#/etc/rc$runlevel.d/K}
			level=${level%%[a-zA-Z]*}
			if [ "$level" = "$CURLEVEL" ]
			then
				continue
			fi
			CURLEVEL=$level
			SCRIPTS=""
			for i in /etc/rc$runlevel.d/K$level*
			do
				# Check if the script is there.
				[ ! -f $i ] && continue

				#
				# Find stop script in previous runlevel but
				# no start script there.
				#
				suffix=${i#/etc/rc$runlevel.d/K[0-9][0-9]}
				previous_stop=/etc/rc$previous.d/K[0-9][0-9]$suffix
				previous_start=/etc/rc$previous.d/S[0-9][0-9]$suffix
				#
				# If there is a stop script in the previous level
				# and _no_ start script there, we don't
				# have to re-stop the service.
				#
				[ -f $previous_stop ] && [ ! -f $previous_start ] && continue

				# Stop the service.
				SCRIPTS="$SCRIPTS $i"
			done
			startup stop $SCRIPTS
		done
	fi

	if [ makefile = "$CONCURRENCY" ]
	then
		if [ S = "$runlevel" ]
		then
			startup boot
		else
			startup $ACTION
		fi
	else
		# Now run the START scripts for this runlevel.
		# Run all scripts with the same level in parallel
		CURLEVEL=""
		for s in /etc/rc$runlevel.d/S*
		do
			# Extract order value from symlink
			level=${s#/etc/rc$runlevel.d/S}
			level=${level%%[a-zA-Z]*}
			if [ "$level" = "$CURLEVEL" ]
			then
				continue
			fi
			CURLEVEL=$level
			SCRIPTS=""
			for i in /etc/rc$runlevel.d/S$level*
			do
				[ ! -f $i ] && continue

				suffix=${i#/etc/rc$runlevel.d/S[0-9][0-9]}
				if [ "$previous" != N ]
				then
					#
					# Find start script in previous runlevel and
					# stop script in this runlevel.
					#
					stop=/etc/rc$runlevel.d/K[0-9][0-9]$suffix
					previous_start=/etc/rc$previous.d/S[0-9][0-9]$suffix
					#
					# If there is a start script in the previous level
					# and _no_ stop script in this level, we don't
					# have to re-start the service.
					#
					if [ start = "$ACTION" ] ; then
						[ -f $previous_start ] && [ ! -f $stop ] && continue
					else
						# Workaround for the special
						# handling of runlevels 0 and 6.
						previous_stop=/etc/rc$previous.d/K[0-9][0-9]$suffix
						#
						# If there is a stop script in the previous level
						# and _no_ start script there, we don't
						# have to re-stop the service.
						#
						[ -f $previous_stop ] && [ ! -f $previous_start ] && continue
					fi

				fi
				SCRIPTS="$SCRIPTS $i"
			done
			startup $ACTION $SCRIPTS
		done
	fi
fi

trap - EXIT # Disable emergency handler

exit 0